This is the Wacker Neuson factory service manual for the ET18, ET20, and ET24 track excavators, also sold under the type numbers E12-02, E12-03, and E12-04, document 1000282523. The 290 page manual covers the 3TNV76-SNSE12 and 3TNV80F-SSNS1 diesel engines fitted to these mini excavators.Chapters run through machine operation, technical data, maintenance, the engine, the hydraulic system, the electrical system, optional equipment such as the grab control and hydraulic quickhitch circuits, and the PowerTilt PTS4.5 attachment.Independent technicians and owners use this PDF to check and adjust valve clearance, torque the cylinder head, set hydraulic operating pressures, trace electrical faults, service the quick coupler, and keep to the correct filter and service intervals. Specifications, wear tolerances, and torque figures are listed for each system so repairs are done to the factory standard.
What's Inside This Wacker Neuson ET18 & variants Manual
| System | Pages | Key Topics |
|---|---|---|
| Operation | 12-41 | Information on This Service Manual, Identification of Warnings and Dangers, Explanation of Symbols and Abbreviations (Conversion Table), Designated Use and Exemption From Liability |
| Technical Data | 42-59 | Models and Trade Names, Engine, Engine Capacities, Traveling drive/axles, Tires/tracks (Rubber Tracks), Fuel Injection Pump, Coolant, Compound Table |
| Maintenance | 60-131 | Information on Maintenance (Responsibilities and Prerequisites, Important Safety Instructions on Maintenance), Service Package |
| Engine | 132-167 | Engine 3TNV76-SNSE12, Checking and Adjusting Valve Clearance, Tightening Order for Cylinder Head Bolts |
| Hydraulic System | 168-205 | Hydraulic Pump, Summation Control P1 – P3, Exploded View of Hydraulic Pump, Pilot Oil Supply Unit, Dismantling the Hydraulic Pump, Assembling the Hydraulic Pump, Main Valve Block |
| Electrical System | 206-251 | Ohm's Law; Power, Measuring Equipment, Measuring Methods, Relays (Use, Mode of Function), Electric Units, Fuses/relays, Alternator, Starter |
| Options | 252-271 | Automatic Engine Speed Setting, Grab Control Circuit, Hydraulic Easy Lock Quickhitch (Hydraulic Quickhitch Pressure Variants), 3Rd Control Circuit (Function) |
| PowerTilt PTS4.5 | 272-290 | Checking the Product, Decompression Valve, Testing the Hydraulic System of the Machine, Specifications/requirements, Tools (Making a Tool for Removing the Seals) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| ET18, ET20, ET24 | ||
| Swivel joint torque | 64 Nm (47 ft.lbs.) | p. 200 |
| All Models | ||
| Hydraulic hose replacement interval | every 6 years | p. 114 |
| Joint rod maximum wear tolerance | 5 % (max. tolerance) | p. 123 |
| Air filter replacement interval | every 1000 o/h or once a year at the latest | p. 66 |
| Hydraulic oil filter insert replacement interval (normal work) | first time after 50 o/h, then every 500 o/h | p. 62 |
| Pressure drop for variable displacement pump P1 (diagnostic limit) | not more than 10 % of the maximum value | p. 102 |
| Pressure drop for variable displacement pump P2 (diagnostic limit) | not more than 10 % of the maximum value | p. 103 |
| Engine Power | 13.4 kW at 2200 rpm (18 hp at 2200 rpm) | p. 43 |
| Engine Idling Speed | 1300 +/− 25 rpm | p. 43 |
| PowerTilt PTS4.5 | ||
| PowerTilt minimum hose/pipe size | 6 mm (0.23 in) | p. 274 |
| ET18 – ET24 | ||
| Joint rod nominal size A | 32 mm (1 1/4 in) | p. 123 |
| all (from 2012 engine) | ||
| Engine Displacement | 1266 cm³ (77.3 in³) | p. 43 |
Wacker Neuson ET18 & variants Common Problems This Manual Covers
Weak or no hydraulic response
Little or no boom, arm, or bucket movement after startup points to the hydraulic system. This section covers the pump overview and the pressure drop limits used to diagnose the variable and gear pumps.
Manual Section: 5 Hydraulic system p. 168Quick coupler will not lock or unlock
Attachment changeover trouble is common when the hydraulic quickhitch is not depressurized first. The options section covers the Hydraulic Easy Lock quickhitch and its pressure variants.
Manual Section: 8 Options p. 252Hard starting or rough running
Starting trouble and rough running send you to engine service. The engine section covers checking and adjusting valve clearance and the cylinder head bolt tightening order.
Manual Section: 4 Engine p. 132Electrical fault or blown fuse
Dead circuits and blown fuses trace to relays, fuses, and the charging parts. The electrical section covers fuses and relays, the alternator, and the starter.
Manual Section: 6 Electrical system p. 206Track or undercarriage wear
Rubber tracks and undercarriage parts wear with hours. The maintenance section covers the service intervals and inspection steps that keep the running gear in spec.
Manual Section: 3 Maintenance p. 60PowerTilt slow or leaking
A tilt attachment that drifts or moves slowly needs its hydraulics checked. The PowerTilt section covers the decompression valve, testing the hydraulic system, and reseal tools.
Manual Section: 9 PowerTilt PTS4.5 p. 272Frequently Asked Questions
Which machines does this manual cover?
It is the service manual for the Wacker Neuson ET18, ET20, and ET24 track excavators, also sold as E12-02, E12-03, and E12-04, document 1000282523. It covers the 3TNV76-SNSE12 and 3TNV80F-SSNS1 engines.
Where are the torque specifications?
The engine section covers the cylinder head bolt tightening order and torque, for example 59 to 63 Nm (43.5 to 46.5 ft.lbs.) on the M9x1.25 second pass. p. 132
What are the hydraulic operating pressures?
The hydraulic system section covers the operating pressures and diagnostic limits, with work and drive hydraulics set to 200 bar (2900 psi) on the ET18 and ET20. p. 168
How often should filters be changed?
The maintenance section lists the intervals, including the hydraulic oil filter every 500 operating hours in normal work and the air filter every 1000 hours or once a year. p. 60
What do I get after purchasing this Wacker Neuson ET18 & variants manual?
Instant PDF download. The full 290-page searchable Service Manual lands in your account right after payment. Open it on a laptop, tablet, or phone out in the shop.
Can I print this manual?
The PDF is DRM-free, so print whatever sections you want to carry out to the shop. Standard letter or A4 paper works fine.
Are hydraulic system diagrams in this Wacker Neuson ET18 & variants manual?
Yes. It includes hydraulic system diagrams, circuit schematics, and component specifications for the ET18 and its variants.
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